Published on September 8, 2008
Classifying Matter (2-1) : Classifying Matter (2-1) Chapter 2 - Matter What is matter? : What is matter? Matter is anything that has mass and takes up space. Are light and sound matter? Why or why not? Is air considered matter? Why or why not? What is chemistry about? : What is chemistry about? Chemistry is about the study of matter and its changes. One important part of chemistry is classification. What are some ways we use classification? How is one way matter is classified? : How is one way matter is classified? Every sample of matter is either an element, a compound, or a mixture. What is water? What is gold? What about vegetable salad? Elements : Elements An element is a substance that cannot be broken down into simpler substances by chemical means. The smallest unit of an element that keeps the element’s chemical properties is an atom. Elements : Elements Each element is made of one kind of atom. C (Carbon), H (Hydrogen), He (Helium) Elements : Elements Each element is represented by a one- or two-letter symbol that is used worldwide. The symbols for elements is either a capital letter or a capital letter followed by a lowercase letter. Li = Lithium O = Oxygen Cu = Copper Molecules : Molecules A molecule is the smallest unit of a substance that behaves like the substance. Compounds : Compounds A compound is a substance made up of atoms of different elements. Each molecule of a compound contains two or more elements that are chemically combined. Iron Oxide is an example of a compound. : Iron Oxide is an example of a compound. What is iron oxide? Compounds : Compounds Every compound differs from the elements that it contains. Chemical Formulas : Chemical Formulas A chemical formula shows how many atoms of each element are in a unit of a substance. If only one atom of an element is present, no subscript is used. Chemical Formulas : Chemical Formulas H2O 2 Hydrogen atoms and 1 Oxygen atom. H2SO4 2 Hydrogem atoms, 1 Sulfur atom, 4 Oxygen atoms Pure Substance : Pure Substance In chemistry the word pure means that it is matter that has a fixed composition and definite properties. (A sample of matter that has definite chemical and physical properties) Mixtures : Mixtures A mixture is a combination of substances that are not chemically combined. Elements and compounds are pure substances but mixtures are not. A mixture can be physically separated into its parts. Example? Pure Substance : Pure Substance Parts of a pure substance are chemically combined and cannot be physically separated. Mixtures : Mixtures Mixtures are defined by how well their substances are mixed. Heterogeneous mixtures Homogeneous mixtures Heterogeneous Mixtures : Heterogeneous Mixtures The substances in this type of mixture are not evenly distributed. Example: Vegetable salad, shirt (cotton, polyester) Homogeneous Mixture : Homogeneous Mixture In this type of mixture the components are evenly distributed. Examples: Vinegar, Kool-Aid, Gasoline Miscible or Not? : Miscible or Not? Miscible means that liquids are able to be mixed. (The liquids in gasoline are miscible). If liquids do not mix well then they are said to be immiscible (Oil and water are immiscible). Can gases mix with liquids? : Can gases mix with liquids? Yes, definitely. Give me an example.
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Classifying Matter-2-1/Physical Science. ... Chemistry 1.2 Classifying Matter (Part 1 of 3) - Duration: 12:39. IsaacsTEACH 38,460 views. 12:39
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